﻿#region Copyright
// Copyright 2008 Chris Varley (http://www.contractdriven.net/)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#endregion

namespace ContractDriven.CommonAssertions
{
    #region False Assertion
    /// <summary>
    /// Describes a guarantee that an expression is false.
    /// </summary>
    public class FalseAssertion : IAssertion
    {
        public bool Condition { get; private set; }
        #region Constructors
        /// <summary>
        /// Describes a guarantee that an expression is false.
        /// </summary>
        /// <param name="condition">The condition to be inspected</param>
        public FalseAssertion(bool condition)
        {
            Contract.Require(Assert.IsNotNull(condition));
            Condition = condition;
        }
        #endregion
        #region IAssertion Members
        public string FailureDescription
        {
            get { return Resource.FalseAssertion; }
        }
        
        #region Eval Method
        public bool Eval()
        {
            return !Condition;
        }
        #endregion
        #endregion
    }
    #endregion
}
